Phase 1B Underwater Archaeological Report for the Onondaga ...

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FINAL Phase IB Underwater Archaeological Resources Report for Onondaga Lake Superfund Site Anomaly 37: Unidentified Anomaly 37 Summary Table Anomaly Identification Unidentified Remedial Impact Cap NRHP Eligibility Unevaluated Recommendation Anomaly Dataset Side Scan (2005) No Magnetometer (2005) 499, 500, 276, 502, 503 Side Scan (2010) 6/2/10 Sector Scan (2010) 6/5/10 ROV (2010) 6/9/10 Diver Observations 6/28/11 Diver Videography No Maps/Charts No Aerial Imagery No Historic Accounts No Research Results A37 is co-located with five magnetic anomalies digitized from CRE’s 2005 data: #276; #499; #500; #502; and #503 (Figure 82). These anomalies were observed on five parallel survey transects spaced 25 ft (8m) apart at a depth of approximately 10 to 12ft (3 to 4m). The magnitude of these anomalies was as high as approximately 400nT at the central dipolar anomaly #276 (Figure 83). Assuming a distance (range) of 7 to 16ft (2 to 5 m), the ferrous mass of this anomaly might be 141 to 2204lb (64 to 1000kg). Side scan sonar data collected in the vicinity of these anomalies in 2010 did not suggest the presence of surficial contacts (debris or structures). The anomaly was investigated using side scan sonar, sector scan sonar and ROV in 2010, and dive verification in 2011, with all results being inconclusive. The cumulative geophysical and observational data suggests that the magnetic target is buried. The spatial extent of the magnetic anomaly, which covers an area of approximately 200 by 100ft (61 by 30.5m), is consistent with the spatial extent of the barge and canal boat wrecks in Onondaga Lake. However, the magnetic intensity is lower and lacks the complexity of other vessel sites. Although, the specific origin of the magnetic anomaly is unknown, LCMM believes the collective data suggests that it is unlikely to represent a cultural resource. Recommendations LCMM recommends no further work for A37. 115
FINAL Phase IB Underwater Archaeological Resources Report for Onondaga Lake Superfund Site Figure 82. Magnetic intensity map of Onondaga Lake showing A37. Figure 83. Graphical overlay of fine-scale magnetism and side scan data on A37 (courtesy CRE). 116
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